EP1648197A2 - Procédé et dispositif pour réduire les rétroactions dans un système acoustique - Google Patents

Procédé et dispositif pour réduire les rétroactions dans un système acoustique Download PDF

Info

Publication number: EP1648197A2
Authority: EP; European Patent Office
Prior art keywords: signal; feedback; modulation; feedback signal; detection
Prior art date: 2004-10-14
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Granted

Application number

EP05109366A

Other languages

German (de)

English (en)

Other versions

EP1648197A3 (fr

EP1648197B2 (fr

EP1648197B1 (fr

Inventor

Volkmar Hamacher

Ulrich Dr. Kornagel

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Sivantos GmbH

Original Assignee

Siemens Audiologische Technik GmbH

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

2004-10-14

Filing date

2005-10-07

Publication date

2006-04-19

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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=35563041&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1648197(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.

2005-10-07 Application filed by Siemens Audiologische Technik GmbH filed Critical Siemens Audiologische Technik GmbH

2006-04-19 Publication of EP1648197A2 publication Critical patent/EP1648197A2/fr

2008-01-23 Publication of EP1648197A3 publication Critical patent/EP1648197A3/fr

2011-09-14 Application granted granted Critical

2011-09-14 Publication of EP1648197B1 publication Critical patent/EP1648197B1/fr

2015-01-07 Publication of EP1648197B2 publication Critical patent/EP1648197B2/fr

2025-10-07 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

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Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Electric hearing aids
- H04R25/45—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback
- H04R25/453—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback electronically
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers
- H04R3/02—Circuits for transducers for preventing acoustic reaction, i.e. acoustic oscillatory feedback
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
- H04R2430/03—Synergistic effects of band splitting and sub-band processing

Definitions

the present invention relates to a method of reducing feedback in an acoustic system by detecting a feedback signal in an input signal and processing the input signal in response to the detected feedback signal to produce an output signal. Moreover, the present invention relates to a corresponding signal processing device for an acoustic system.
the acoustic system is, for example, a mobile radio device, a headset, a public address system and in particular a hearing aid or middle ear implant.
Feedback Acoustic feedback, hereafter referred to as feedback, is common in hearing aids, especially when it comes to high gain devices. These feedbacks are expressed in strong oscillations of a certain frequency and can be heard as whistling. This "whistling" is usually very uncomfortable for the hearing aid wearer himself as well as for people in his immediate vicinity. Feedback can be z. B. occur when sound that was recorded on the hearing aid microphone, amplified by a signal amplifier and output via the handset, gets back to the microphone and is reinforced again.
the simplest approach to reducing feedback is to permanently reduce hearing instrument gain so that the loop gain remains below the critical limit even in adverse situations.
the decisive disadvantage is that this limitation can no longer achieve the reinforcements required for severe deafness.
Other approaches see a measurement of loop gain during the hearing aid fitting and reduce with the help of so-called notch filters (narrow-band notch filters) the gain targeted in the critical area.
notch filters narrow-band notch filters
the first class comprises the so-called compensation algorithms, which use adaptive filters to estimate the feedback component in the microphone signal and neutralize it by subtraction, thus not impairing hearing aid amplification.
these compensation methods use uncorrelated, ie. H. ideally white, input signals ahead. Tonal input signals, which always have a high temporal correlation, lead to an erroneous estimation of the feedback path, which can lead to the erroneous subtraction of the tonal input signal itself.
the second class contains the algorithms that only become active when feedback whistles are present. They generally include a feedback whistle detection mechanism that continuously monitors the microphone signal for feedback oscillation. If feedback-type oscillations are detected, the hearing aid gain at the corresponding point is reduced to such an extent that the loop gain drops below the critical limit.
the gain reduction can, for. B. by lowering a frequency channel or by activating a suitable narrow-band notch filter (Notchfilter) done.
the disadvantage is that the oscillation detectors in principle do not distinguish between tonal input signals and feedback whistles can. The result is that tonal input signals are held for feedback oscillations and then inadvertently lowered in level by the reduction mechanism (eg, notch filter).
Another countermeasure is to slow down the adaptation of the filter so that all relevant environmental tonal signals are not attacked.
this also has the consequence that the compensation filter can no longer follow rapid changes in the feedback path quickly, so that feedback whistles develop for a certain time, which only disappears again when the feedback path has stabilized and the filter has again been adapted with sufficient accuracy ,
a step size control of the compensation filter is known, wherein the feedback detector operates according to the principle of bandwidth detection. If a narrow bandwidth of the input signal of the hearing device is detected by the bandwidth detector in the frequency band prone to feedback whistles, it is assumed that feedback whistling is present. A distinction of natural, narrow-band signals with spectral components in this frequency band, such. As music, but is not possible. In addition, the feedback whistle must represent a dominant signal component in order to be recognized.
EP 1 052 881-A2 discloses an oscillation detector for detecting feedbacks. Again, the feedback whistles must be very clear to be recognized.
the object of the present invention is thus to further improve the reduction of feedback of a hearing aid.
this object is achieved by a method for reducing feedback in an acoustic system by detecting a feedback signal in an input signal and processing the input signal in response to the detected feedback signal to produce an output signal, and modulating the output signal so that the feedback signal is also modulated accordingly wherein the detection of the feedback signal is based on the modulation.
the invention provides a signal processing device for an acoustic system with a processing device for generating an output signal from an input signal taking into account a feedback signal, a modulation device for modulating the output signal, so that upon feedback results in a correspondingly modulated feedback signal, and a detection device for detecting the modulated feedback signal based on its modulation.
the underlying idea is to impose imperceptible features on the output signal of the acoustic system and in particular the hearing aid for the hearing aid wearer. This makes it possible to determine by appropriate analysis of the input signal whether the input signal is feedback or a "normal" external input signal (useful signal). The determination of the characteristic of the feature in the input signal also allows conclusions to be drawn about the corresponding proportions of feedback and useful signal. This can then be used directly to control feedback reduction algorithms.
the processing of the input signal preferably takes place with an adaptable filter whose adaptation speed and / or strength depends on the quantity of the detected feedback signal.
adaptation speed increases in proportion to the quantity of the detected feedback signal. If, for example, the feature analysis of the input signal is negative, ie it contains no feedback signal, then the adaptation speed of the compensation filter mentioned above can be slowed down so that the filter is not adjusted by tonal input signals and these are not attacked. If, on the other hand, the feature is detected in the input signal, the effectiveness and / or speed of the feedback compensator is set to the value at which feedback is optimally suppressed.
At least one notch filter may be activated for processing the input signal.
the modulation of the output signal can be done by amplitude modulation or modulation of the signal envelope.
the perceptibility of the modulation decreases very sharply from about 6 Hz modulation frequency.
Corresponding perception thresholds of the modulation depth as a function of the modulation frequency and the signal level are known from psychoacoustics.
the output signal can also be modulated for example by reducing the amplitude to zero and thus by inserting signal gaps.
signal gaps are no longer perceptible at medium levels below about 5 ms.
the detection of feedback can be performed separately in several subbands. As a result, the gain, but also the reduction of feedback in the individual subbands can be adjusted individually.
a closed loop in the signal processing device can be used for a signal modification.
the modulated signal passes through the loop several times, so that the corresponding signal modification is caused.
FIG. 1 shows a hearing aid HG whose input forms a microphone M.
the recorded signal is forwarded as an input signal ES to a processing unit V. There it is processed and possibly reinforced.
the resulting output signal AS is delivered to a handset H. Via a feedback path RP, the output signal of the handset H is fed back to the microphone M.
a feedback path RP With open supply, there is primarily an acoustic feedback path. In general, however, electromagnetic, electrical, magnetic and other feedback are also conceivable.
the feedback signal RS resulting from the feedback path is added to a useful signal NS, and the sum signal is picked up by the microphone M.
the signal path from the microphone M via the hearing aid processing V, the handset H, the feedback path RP back to the microphone M represents a loop.
H. the gain experienced by a signal passing through this loop is at least 1.0 at least at one frequency, and when the phase condition is met, feedback whistling occurs. Even if the loop gain is just below this limit, audible feedback effects, e.g. B. sound changes on.
One successful method for suppressing the feedback effects is the digital replica of the feedback path RP. This is simulated by an adaptive filter AF, which is fed by the output signal of the processing unit V. A corresponding compensation signal KS, which originates from the compensating, adaptive filter AF, is subtracted from the input signal ES of the microphone M and the resulting difference signal is fed to the processing unit V.
step size control An important component in the adaptive algorithm for determining the feedback path is its step size control. It indicates the speed with which the adaptive compensation filter adapts to the outer feedback path RP. Since there is no meaningful compromise for a fixed step size, it must be adapted to the current situation in which the system is located.
a large step size for a fast adaptation of the adaptive compensation filter AF to the outer feedback path RP is to be aimed for.
a disadvantage of a large step size is the generation of perceptible signal artifacts.
the step size should be vanishingly small.
the situation in which the loop gain is just below 1 or greater than / equal to 1 and the phase condition is fulfilled at least at one frequency is referred to as the feedback situation.
the step size should or will be large. This ensures that the algorithm adapts the adaptive compensation filter AF only if it differs significantly in its characteristic from the characteristic of the feedback path RP, ie. H. if there is a need for post-adaptation.
a feedback detector is provided.
a modulation device MO is provided, which is connected between the processing unit V and the receiver H according to FIG. It modulates the output signal AS to a modulated output signal AS '.
the modulation of the output signal AS is imperceptible. In the event of a feedback situation, a significant proportion of the sound signal emitted by the receiver H returns to the microphone M and is recorded in the device together with the ambient signal.
the feedback path RP can basically be designed as desired. Ie. there does not have to be an acoustic feedback signal RS, as indicated in FIG. 1, which is added with an acoustic useful signal NS in front of the microphone M. Rather, the feedback in the microphone M can also be done for example via structure-borne noise or electromagnetic coupling.
the input signal ES of the microphone M is analyzed by a feedback detector RD.
the feedback signal RS can be detected due to its modulation.
a downstream controller S drives the adaptive compensation filter AF according to the detection result of the feedback detector RD. As a result, for example, the adaptation speed of the adaptive filter AF is changed.
FIG. 3 essentially corresponds to that of FIG. 2.
the feedback path is purely acoustic, as in the example of FIG.
Another difference from the circuit of FIG. 2 is that the signal for the feedback detector RD is not picked up directly behind the microphone M but after the subtraction of the compensation signal of the adaptive filter AF at the point A.
the strength of the modulation of the signal at the point A is an image of the difference between the effect of the feedback path RP and the effect of the adaptive compensation filter AF.
FIG. 3 it is indicated in FIG. 3 that a step size control can be integrated in the feedback detector RD, so that it is possible to dispense with a separate control module.
the remaining components of the embodiment of FIG 3 correspond to those of the embodiment of FIG 2. In this regard, reference is thus made to the description of FIG.
the phase of the output signal AS is modulated since the human ear is largely insensitive to phase changes.
the phase of the output signal AS with a specific frequency referred to here as the modulation frequency f_mod
the modulation frequency f_mod is linearly rotated back and forth between two phase values.
the phase values are ⁇ and ⁇ + ⁇ / 2, where ⁇ is any solid phase.
a detectable tremolo component with a frequency of f_mod is formed in the signal loop.
the tremolo component can be detected by means of a frequency demodulator in the feedback detector RD. It is advantageous to construct the feedback detector RD with a filter bank, as shown in FIG 4, the z. B. the input signal ES with multiple bandpasses BP1, BP2, ..., BPn divided into subbands. After each bandpass an analysis unit AE and a threshold value SW is arranged in each case. The output signals of the signal paths for each subband are optionally supplied to an OR gate OR.
the respective analysis units AE and threshold SW can be identical to each other. Thus, the analysis in this example is done in each subband path in the same way. If the analysis result in a band exceeds a certain threshold, the associated threshold switch SW responds, i. H. a feedback situation is detected for this band.
the step size control of the adaptive filter AF can also be differentiated in addition to the simple threshold decision according to FIG. 4, according to which only the presence or absence of a feedback is detected.
the step size can be determined by proportional conversion of the estimated strength of the signal modulation at point A. This can also be done again via a subband approach. The greater the signal modification detected, the higher would be the need for post-adaptation, ie. H. the higher the necessary step size would have to be chosen.
the step size can thus be continuously adapted to the signal modulation. In a pure threshold decision, however, the step size is set high for a certain fixed time or for the time frame in which feedback is detected. Otherwise, it takes on a small value.
the phase is not sinusoidally modulated but generally changed according to a particular profile, e.g. B. linearly in one direction (forward or backward) rotated.
a chirp characteristic is then formed in the closed signal loop for this example.
a chirp detector would be used.

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Health & Medical Sciences (AREA)
General Health & Medical Sciences (AREA)
Otolaryngology (AREA)
Physics & Mathematics (AREA)
Engineering & Computer Science (AREA)
Acoustics & Sound (AREA)
Signal Processing (AREA)
Neurosurgery (AREA)
Circuit For Audible Band Transducer (AREA)
Soundproofing, Sound Blocking, And Sound Damping (AREA)
Amplifiers (AREA)

EP05109366.4A 2004-10-14 2005-10-07 Procédé et dispositif pour réduire les rétroactions dans un système acoustique Expired - Lifetime EP1648197B2 (fr)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
DE102004050304A DE102004050304B3 (de)	2004-10-14	2004-10-14	Verfahren zur Reduktion von Rückkopplungen bei einem Akustiksystem und Signalverarbeitungsvorrichtung

Publications (4)

Publication Number	Publication Date
EP1648197A2 true EP1648197A2 (fr)	2006-04-19
EP1648197A3 EP1648197A3 (fr)	2008-01-23
EP1648197B1 EP1648197B1 (fr)	2011-09-14
EP1648197B2 EP1648197B2 (fr)	2015-01-07

Family

ID=35563041

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP05109366.4A Expired - Lifetime EP1648197B2 (fr)	2004-10-14	2005-10-07	Procédé et dispositif pour réduire les rétroactions dans un système acoustique

Country Status (7)

Country	Link
EP (1)	EP1648197B2 (fr)
JP (1)	JP4309390B2 (fr)
CN (1)	CN1774144B (fr)
AT (1)	ATE524937T1 (fr)
AU (1)	AU2005220246B2 (fr)
DE (1)	DE102004050304B3 (fr)
DK (1)	DK1648197T4 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE102006023723A1 (de) *	2006-05-19	2007-11-22	Siemens Audiologische Technik Gmbh	Hörvorrichtung mit Rückkopplungsdetektion und entsprechendes Verfahren
DE102009016845B3 (de) *	2009-04-08	2010-08-05	Siemens Medical Instruments Pte. Ltd.	Anordnung und Verfahren zur Erkennung von Rückkopplungen bei Hörvorrichtungen
US8280088B2 (en)	2006-05-19	2012-10-02	Siemens Audiologische Technik Gmbh	Hearing apparatus with feedback detection and corresponding method
CN104575520A (zh) *	2014-12-16	2015-04-29	中国农业大学	一种结合心理声学评价的声波监测装置及方法

Families Citing this family (6)

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Publication number	Priority date	Publication date	Assignee	Title
DE102006029194B4 (de) *	2006-06-26	2010-04-15	Siemens Audiologische Technik Gmbh	Vorrichtung und Verfahren zur Schrittweitensteuerung eines adaptiven Filters
EP2148527B1 (fr) *	2008-07-24	2014-04-16	Oticon A/S	Système de réduction de réponse acoustique pour les appareils d'aide auditive utilisant une transmission de signal inter-auriculaire, procédé et utilisation
DE102008036803B3 (de) *	2008-08-07	2009-12-17	Siemens Medical Instruments Pte. Ltd.	Anordnung und Verfahren zur Regelung einer Rückkopplungsunterdrückung bei Hörvorrichtungen
CN102740189B (zh) *	2011-04-01	2014-10-08	中国科学院声学研究所	一种基于时间反转的声反馈抑制方法
CN104320750B (zh) *	2014-11-25	2018-08-17	厦门莱亚特医疗器械有限公司	一种测量助听器反馈路径的方法
WO2023277022A1 (fr) *	2021-06-28	2023-01-05	ヤマハ株式会社	Dispositif de traitement du son, procédé de traitement du son et programme

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JP3447060B2 (ja) †	1994-04-12	2003-09-16	コーニンクレッカフィリップスエレクトロニクスエヌヴィ	エコー消去を改善した信号増幅システム
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EP1052881B1 (fr) *	1999-05-12	2010-10-20	Siemens Audiologische Technik GmbH	Prothèse acoustique avec détecteur d'oscillations et méthode de détection d'oscillations dans une prothèse acoustique
DK1203509T3 (da) *	1999-07-19	2007-01-02	Oticon As	Tilbagekoblingsannullering med anvendelse af båndbreddedetektering
EP1191814B2 (fr) †	2000-09-25	2015-07-29	Widex A/S	Prothèse auditive multibande avec filtres adaptatifs multibandes pour la suppression de la rétroaction acoustique .
CA2427845C (fr) *	2001-10-05	2010-07-13	Phonak Ag	Procede permettant de verifier la presence d'une composante de signal et dispositif servant a mettre en oeuvre ce procede
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2004
- 2004-10-14 DE DE102004050304A patent/DE102004050304B3/de not_active Expired - Fee Related
2005
- 2005-10-07 AT AT05109366T patent/ATE524937T1/de active
- 2005-10-07 EP EP05109366.4A patent/EP1648197B2/fr not_active Expired - Lifetime
- 2005-10-07 AU AU2005220246A patent/AU2005220246B2/en not_active Ceased
- 2005-10-07 DK DK05109366.4T patent/DK1648197T4/en active
- 2005-10-12 JP JP2005297209A patent/JP4309390B2/ja not_active Expired - Fee Related
- 2005-10-14 CN CN200510113725.2A patent/CN1774144B/zh not_active Expired - Fee Related

Patent Citations (1)

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Publication number	Priority date	Publication date	Assignee	Title
US6347148B1 (en)	1998-04-16	2002-02-12	Dspfactory Ltd.	Method and apparatus for feedback reduction in acoustic systems, particularly in hearing aids

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE102006023723A1 (de) *	2006-05-19	2007-11-22	Siemens Audiologische Technik Gmbh	Hörvorrichtung mit Rückkopplungsdetektion und entsprechendes Verfahren
US8280088B2 (en)	2006-05-19	2012-10-02	Siemens Audiologische Technik Gmbh	Hearing apparatus with feedback detection and corresponding method
DE102009016845B3 (de) *	2009-04-08	2010-08-05	Siemens Medical Instruments Pte. Ltd.	Anordnung und Verfahren zur Erkennung von Rückkopplungen bei Hörvorrichtungen
US8259974B2 (en)	2009-04-08	2012-09-04	Siemens Medical Instruments Pte. Ltd	Configuration and method for detecting feedback in hearing devices
EP2239962A3 (fr) *	2009-04-08	2012-12-05	Siemens Medical Instruments Pte. Ltd.	Agencement et procédé de détection de contre-réactions pour appareils auditifs
CN104575520A (zh) *	2014-12-16	2015-04-29	中国农业大学	一种结合心理声学评价的声波监测装置及方法

Also Published As

Publication number	Publication date
DK1648197T3 (da)	2011-12-19
CN1774144A (zh)	2006-05-17
DE102004050304B3 (de)	2006-06-14
DK1648197T4 (en)	2015-04-13
EP1648197A3 (fr)	2008-01-23
ATE524937T1 (de)	2011-09-15
CN1774144B (zh)	2013-12-18
JP4309390B2 (ja)	2009-08-05
EP1648197B2 (fr)	2015-01-07
JP2006115509A (ja)	2006-04-27
EP1648197B1 (fr)	2011-09-14
AU2005220246A1 (en)	2006-05-04
AU2005220246B2 (en)	2007-09-27

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